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The epithelium of the human circumvallate papillae was divided into three transverse portions from its superior surface; upper (UP), middle (MP) and lower portion (LP). Three transverse sections of the taste bud in one portion, totally nine sections in three portions, were selected from many sections and photographed in 6, 500 time magnification by electron microscope. After making photomontages of these nine sections magnified in 25, 000 times, the areas of the somata were measured from the traced pictures of photomontages by planimeter. The exact method used in this study was previously reported in Jap. Jour. Otol. Tokyo (1977).The areas of 255 somata at LP, 241 at MP and 292 at UP were measured. The mean value of the area was 3.6μ2 at LP, 7.8μ2 at MP and 6.9μ2 at UP. Fifty to 65 % of the somata showed the area of 0 to 2.0μ2 at each portion. The area of LP was generally smaller than that of remaining two portions.The somata were divided into three components, cell body, intercellular detritus and branching cytoplasmic process, from the view point of their location and morphological figures by electron microscope. The areas of these components were measured. The area of the cell body was over 12.0μ2, intercellular detritus among 1.0 to 9.0μ2 and branching cytoplasmic process under 0.3μ2. It was suggested that the cell number in one taste bud is 10.7 to 27.3 from area distributions of somata.

A QUANTITATIVE EVALUATION OF THE AREA AND THE NUMBER OF THE SOMATA IN THE HUMAN CIRCUMVALLATE TASTE BUD BY ELECTRON MICROSCOPE